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/* CC0 (Public domain) - see LICENSE file for details */
#ifndef GNUTLS_LIB_EXTRAS_HEX_H
#define GNUTLS_LIB_EXTRAS_HEX_H
#include "config.h"
#include <stdbool.h>
#include <stdlib.h>
/**
* hex_decode - Unpack a hex string.
* @str: the hexadecimal string
* @slen: the length of @str
* @buf: the buffer to write the data into
* @bufsize: the length of @buf
*
* Returns false if there are any characters which aren't 0-9, a-f or A-F,
* of the string wasn't the right length for @bufsize.
*
* Example:
* unsigned char data[20];
*
* if (!hex_decode(argv[1], strlen(argv[1]), data, 20))
* printf("String is malformed!\n");
*/
bool hex_decode(const char *str, size_t slen, void *buf, size_t bufsize);
/**
* hex_encode - Create a nul-terminated hex string
* @buf: the buffer to read the data from
* @bufsize: the length of @buf
* @dest: the string to fill
* @destsize: the max size of the string
*
* Returns true if the string, including terminator, fit in @destsize;
*
* Example:
* unsigned char buf[] = { 0x1F, 0x2F };
* char str[5];
*
* if (!hex_encode(buf, sizeof(buf), str, sizeof(str)))
* abort();
*/
bool hex_encode(const void *buf, size_t bufsize, char *dest, size_t destsize);
/**
* hex_str_size - Calculate how big a nul-terminated hex string is
* @bytes: bytes of data to represent
*
* Example:
* unsigned char buf[] = { 0x1F, 0x2F };
* char str[hex_str_size(sizeof(buf))];
*
* hex_encode(buf, sizeof(buf), str, sizeof(str));
*/
static inline size_t hex_str_size(size_t bytes)
{
return 2 * bytes + 1;
}
/**
* hex_data_size - Calculate how many bytes of data in a hex string
* @strlen: the length of the string (with or without NUL)
*
* Example:
* const char str[] = "1F2F";
* unsigned char buf[hex_data_size(sizeof(str))];
*
* hex_decode(str, strlen(str), buf, sizeof(buf));
*/
static inline size_t hex_data_size(size_t slen)
{
return slen / 2;
}
#endif /* GNUTLS_LIB_EXTRAS_HEX_H */
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